Leaf oscillation and upward ejection of droplets in response to drop impact

During heavy rainstorms, how can pathogenic spores at the surface of plant leaves travel upward and contaminate other leaves above? The spores are released in the sessile drops left on the leaves by previous raindrops. In this manuscript, we show that upon impact of a large raindrop, a leaf may strongly vibrate. The subsequent inertial forces may be sufficient to expel water from its surface. We describe this droplet ejection mechanism as a function of both leaf and raindrop properties. The droplets inherit from the leaf velocity, so some of them can be shot upward. This ejection mechanism likely induces a significant upward flux of biological material during rainstorms.